US11967266B2 - MOG circuit and display panel - Google Patents
MOG circuit and display panel Download PDFInfo
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- US11967266B2 US11967266B2 US17/051,443 US202017051443A US11967266B2 US 11967266 B2 US11967266 B2 US 11967266B2 US 202017051443 A US202017051443 A US 202017051443A US 11967266 B2 US11967266 B2 US 11967266B2
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Definitions
- the present invention relates to a display technology, such as an MOG driving technique, and more particularly, to a MOG circuit and a display panel.
- the scan signal outputted by an MOG (MUX on Gate) circuit is related to the received MUX signal.
- MOG MUX on Gate
- GOA gate driver on array
- MUX MUX on array
- the MUX signal is often used to adjust the voltage level of the scan signal to the right level.
- TFT thin film transistors
- the MUX signal needs to be transformed from a high voltage level to a low voltage level. But such an operation is limited by the loading capability of the MUX circuit. If the scan signal cannot reach the required level of the turn-off state, the all-gate-off function cannot be achieved.
- One objective of an embodiment of the present invention is to provide a MOG circuit and a display panel to solve the above-mentioned issue, where the voltage level of the scan signal is not low enough for the turn-off state because of the unsatisfactory loading capability.
- an MOG circuit having a plurality of cascaded MOG sub-circuits comprises: a current-stage GOA circuit, configured to generate a first node signal and a second node signal; and a current-stage MUX circuit, connected to the current-stage GOA circuit, a first low voltage level signal and a MUX signal, configured to control the MUX signal according to the first node signal and/or the second node signal to output a scan signal; wherein when the MOG circuit outputs the scan signal of a turn-off state, the first node signal controls the current-stage MUX circuit to stop inputting the MUX signal and the second node signal controls the current-stage MUX circuit to pull down a voltage level of the scan signal to a voltage level of the first low voltage level signal.
- the current-stage MUX circuit comprises at least two MUX units connected in parallel; a first input end of the MUX unit is connected to the MUX signal; a second input end of the MUX unit is connected to the first low voltage level signal; a first control end of the MUX unit is connected to the first node signal; a second control end of the MUX unit is connected to the second node signal; and an output end of the MUX unit is configured to the scan signal.
- the current-stage GOA circuit is connected to a second low voltage level signal; and the voltage level of the first low voltage level signal is identical to or different from a voltage level of the second low voltage level signal.
- the current-stage GOA circuit comprises: a first global control unit, configured to pull down a voltage level of the first node signal to a voltage level of the second low voltage level signal according to a first global control signal, the first global control unit comprising: a first end, connected to the first node signal; a second end, connected to the second node signal; and a control end, connected to the first global control signal.
- the current-stage MOG circuit comprises: a second global control unit, configured to pull up a voltage level of the first node signal to a voltage level of a second global control signal according to the second global control signal, the second global control unit comprising: an input end, connected to the second global control signal; and a control end, connected to the second global control signal.
- the current-stage GOA circuit comprises: a cascading unit, configured to control an output of a high voltage level signal according to the first node signal of a corresponding stage, the cascading unit comprising: an input end, connected to a high voltage level signal; and a control end, connected to the first node signal of the corresponding stage.
- the current-stage GOA circuit further comprises: a first generating unit, configured to generate the first node signal, the first generating unit comprising: an input end, connected to a current-stage clock signal; an output end, connected to the first node signal; and a control end, connected to an output end of the cascading unit.
- the current-stage GOA circuit further comprises: a second generating unit, configured to generate the second node signal, the second generating unit comprising: an input end, connected to a third global control signal; a control end, connected to a clock signal of a corresponding stage; and an output end, connected to the second node signal.
- the current-stage GOA circuit further comprises: a first pull-down unit, configured to pull down a voltage level of the output end of the cascading unit to a voltage level of the second low voltage level signal, the first pull-down unit comprising: a first end, connected to the second low voltage level signal; a second end, connected to the output end of the cascading unit; and a control end, connected to the second node signal.
- the second pull-down unit comprises a ninth TFT; an input end of the ninth TFT is connected to the second low voltage level signal; an output end of the ninth TFT is connected to the output end of sixth TFT, the gate of the first TFT, the output end of the third TFT and the output end of the fourth TFT; and a gate of the ninth TFT is connected to the output end of the seventh TFT.
- the current-stage GOA circuit further comprises: a second pull-down unit, configured to pull down a voltage level of the first node signal to a voltage level of the second low voltage level signal, the second pull-down unit comprising: a first end, connected to the second low voltage level signal; a second end, connected to the first node signal; and a control end, connected to the second low voltage level signal.
- a display panel comprises the above-mentioned MOG circuit.
- the MOG circuit controls the current-stage MOG circuit through the first node signal to block the input of the MUX signal. At the same time, the MOG circuit controls the current-stage MUX circuit through the second node signal such that the voltage level of the scan signal is pulled down to the voltage level of the first low voltage level signal. In this way, all the scan signals could satisfy the turn-off stage while the MUX circuit has a lower loading capability.
- FIG. 1 is a functional block diagram of a MOG circuit according to an embodiment of the present invention.
- FIG. 2 is a diagram of a MOG circuit according to a first embodiment of the present invention.
- FIG. 3 is a diagram of a MOG circuit according to a second embodiment of the present invention.
- FIG. 4 is a diagram of waveforms of related signals in the MOG circuit according to an embodiment of the present invention.
- FIG. 5 is a diagram of a display panel according to an embodiment of the present invention.
- a MOG circuit is disclosed according to an embodiment of the present invention.
- the MOG circuit comprises a plurality of cascaded MOG sub-circuits.
- One of the cascaded MOG sub-circuits comprises a current-stage GOA circuit 100 and a current-stage MUX circuit 200 .
- the current-stage circuit 100 is configured to generate a corresponding first node signal JS 1 (N) and a corresponding second node signal JS 2 (N).
- the current-stage MUX circuit 200 is connected to the current-stage GOA circuit 100 , the first low voltage level signal VGL 1 and the MUX signal and is configured to control the MUX signal according to the first node signal JS 1 (N) and/or the second node signal JS 2 (N) to output a corresponding scan signal.
- the first node signal JS 1 (N) controls the current-stage MUX circuit 200 to stop inputting the MUX signal
- the second node signal JS 2 (N) controls the current-stage MUX circuit 200 to pull down a voltage level of the scan signal to a voltage level of the first low voltage level signal VGL 1 .
- the MOG circuit controls the current-stage MUX circuit 200 through the first node signal JS 1 (N) to block the input of the MUX signal.
- the MOG circuit controls the current-stage MUX circuit 200 through the second node signal JS 2 (N) to pull down the voltage level of the scan signal to the voltage level of the first low voltage signal VGL 1 .
- all the scan signals could be low enough to satisfy the turn-off state under the condition that the MUX circuit has a lower loading capability.
- the display panel could still be normally driven.
- the current-stage MUX circuit 200 comprises at least two MUX units 10 connected in parallel.
- the first input end of the MUX unit 10 is connected to the MUX signal.
- the second input end of the MUX unit 10 is connected to the first low voltage level signal VGL 1 .
- the first control end of the MUX unit 10 is connected to the first node signal JS 1 (N).
- the second control end of the MUX unit 10 is connected to the second node signal JS 2 (N).
- the output end of the MUX unit 10 is configured to output the corresponding scan signal.
- Each of the MUX units 10 could comprise the first TFT T 1 and the second TFT T 2 .
- the input of the first TFT T 1 is connected to the corresponding MUX signal.
- the output end of the first TFT T 1 is connected to the input end of the second TFT T 2 and the output end of the first TFT T 1 is used as an input node of one of the scan signals.
- the output end of the second TFT T 2 is connected to the first low voltage signal VGL 1 .
- the first node signal JS 1 (N) is connected to the gate of the first TFT T 1 .
- the second node signal JS 2 (N) is connected to the gate of the second TFT T 2 .
- the number of the MUX units 10 in the current-stage MUX circuit 200 could be 2 but not limited to be 2. It could be 3, 6, 9, or 12. This number could be adjusted according to the actual demands.
- the current-stage MUX circuit 200 comprises 3 MUX units.
- the first MUX unit 10 receives an N th -stage MUX signal MUX(N) and correspondingly outputs an N th -stage scan signal G(N).
- the second MUX unit 10 receives the (N+1) th -stage MUX signal MUX(N+1) and correspondingly outputs the (N+1) th -stage scan signal G(N+1).
- the third MUX unit 10 receives the (N+2) th -stage MUX signal MUX(N+2) and correspondingly outputs the (N+2) th -stage scan signal G(N+2).
- the current-stage GOA circuit 100 is connected to the second low voltage level signal VGL 2 .
- the first low voltage level signal VGL 1 and the second low voltage level signal VGL 2 are the same or different.
- the current-stage GOA circuit 100 and the current-stage MUX circuit 200 use the same low voltage level signal. This could reduce the number of signals in the MOG circuit. If the first low voltage level signal VGL 1 and the second low voltage level signal VGL 2 are different, this means the current-stage MUX circuit 200 and the current-stage GOA circuit 100 respectively use the first low voltage level signal VGL 1 and the second low voltage level signal VGL 2 . Because the two circuits respectively use two independent low voltage level signals, it could reduce the interference between the two circuits and thus prevent from influencing the operation of the MOG circuit. This could improve the reliability of the MOG circuit.
- the current-stage GOA circuit 100 comprises a first global control unit 20 .
- the first end of the first global control unit 20 is connected to the first node signal JS 1 (N).
- the second end of the first global control unit 20 is connected to the second node signal JS 2 (N).
- the control end of the first global control unit 20 is connected to the first global control signal GAS 1 .
- the first global control unit 20 is configured to pull down the voltage level of the first node signal to the voltage level of the second low voltage level signal VGL 2 according to the first global control signal GAS 1 .
- the first global control unit 20 comprises a third TFT T 3 .
- the input end of the third TFT T 3 is connected to the second low voltage level signal VGL 2 .
- the output end of the third TFT T 3 is connected to the first node signal JS 1 (N).
- the control end of the third TFT is connected to the first global control signal GAS 1 .
- the current-stage GOA circuit 100 further comprises a second global control unit 30 .
- the second global control signal GAS 2 is connected to the input end and the control end of the second global control unit 30 .
- the output end of the second global control unit 30 is connected to the first node signal JS 1 (N).
- the second global control unit 30 is configured to pull up the voltage level of the first node signal JS 1 (N) to the voltage level of the second global control signal GAS 2 according to the second global control signal GAS 2 .
- the second global control unit 30 comprises a fourth TFT T 4 .
- the output end of the fourth TFT T 4 is connected to the first node signal JS 1 (N).
- the second global control signal GAS 2 is connected to the input end of the fourth TFT T 4 and the gate of the fourth TFT T 4 .
- the current-stage GOA circuit 100 further comprises a cascading unit 40 .
- the input end of the cascading unit 40 is connected to a high voltage level signal VGH.
- the control end of the cascading unit 40 is connected to the first node signal JS 1 (N) of a corresponding stage.
- the cascading unit 40 is configured to control the output of the high voltage level signal VGH according to the first node signal JS 1 (N) of the corresponding stage.
- the cascading unit 40 could comprise a fifth TFT T 5 .
- the input end of the fifth TFT T 5 is connected to the high voltage level signal VGH.
- the gate of the fifth TFT T 5 could be connected to, but not limited to, the previous-stage first node signal JS(N ⁇ 1). In the actual implementation, the gate of the fifth TFT T 5 could be connected to the first node signal JS(N) of another stage.
- the current-stage GOA circuit 100 further comprises a first generating unit 50 .
- the input end of the first generating unit 50 is connected to a current-stage clock signal CK(N).
- the output end of the first generating unit 50 is connected to the first node signal JS 1 (N).
- the control end is connected to the output end of the cascading unit.
- the first generating unit 50 is configured to generate the first node signal.
- the first generating unit 50 comprises a sixth TFT T 6 .
- the gate of the sixth TFT T 6 is connected to the output end of the fifth TFT T 5 .
- the input end of the sixth TFT T 6 receives the current-stage clock signal CK(N).
- the output end of the sixth TFT T 6 is configured to output the first node signal JS 1 (N).
- the current-stage GOA circuit further comprises a second generating unit 60 .
- the input end of the second generating unit 60 is connected to a third global control signal GAS 3 .
- the control end of the second generating unit 60 is connected to a clock signal of a corresponding stage.
- the output end of the second generating unit 60 is connected to the second node signal JS 2 (N).
- the second generating unit 60 is configured to generate the second node signal JS 2 (N).
- the second generating unit 60 could comprise a seventh TFT T 7 .
- the input end of the seventh TFT T 7 receives the third global control signal GAS 3 .
- the gate of the seventh TFT T 7 could receive, but not limited to, a previous-stage clock signal CK(N+1).
- the gate of the seventh TFT T 7 could receive a clock signal of another stage.
- the output end of the seventh TFT T 7 is configured to output the second node signal JS 2 (N).
- the current-stage GOA circuit further comprises a first pull-down unit 70 .
- the first end of the first pull-down unit 70 is connected to the second low voltage level signal VGL 2 .
- the second end of the first pull-down unit 70 is connected to the output end of the cascading unit 40 .
- the control end of the first pull-down unit 70 is connected to the second node signal JS 2 (N).
- the first pull-down unit 70 is configured to pull down the voltage level of the output end of the cascading unit 40 to the voltage level of the second low voltage level signal VGL 2 .
- the first pull-down unit 70 comprises an eighth TFT T 8 .
- the input end of the eighth TFT T 8 is connected to the second low voltage level signal VGL 2 .
- the output end of the eighth TFT T 8 is connected to the output end of the fifth TFT T 5 and the gate of the sixth TFT T 6 .
- the gate of the eighth TFT T 8 is connected to the output end of the seventh TFT T 7 and the gate of the second TFT T 2 .
- the current-stage GOA circuit 100 further comprises a second pull-down unit 80 .
- the first end of the second pull-down unit 80 is connected to the second low voltage level signal VGL 2 .
- the second end of the second pull-down unit 80 is connected to the first node signal JS 1 (N).
- the control end of the second pull-down unit 80 is connected to the second low voltage level signal VGL 2 .
- the second pull-down unit 80 is configured to pull down the voltage level of the first node signal JS 1 (N) to the voltage level of the second low voltage level signal VGL 2 according to the second low voltage level signal VGL 2 .
- the second pull-down unit 80 comprises a ninth TFT T 9 .
- the input end of the ninth TFT T 9 is connected to the second low voltage level signal VGL 2 .
- the output end of the ninth TFT T 9 is connected to the output end of sixth TFT T 6 , the gate of the first TFT T 1 , the output end of the third TFT T 3 and the output end of the fourth TFT T 4 .
- the gate of the ninth TFT T 9 is connected to the output end of the seventh TFT T 7 .
- the first to ninth TFTs (T 1 -T 9 ) in the above embodiments could be N-type TFTs. It could be understood that the first to ninth TFTs (T 1 -T 9 ) could also be P-type TFTs or any other type of TFTs.
- the signals in the above embodiments could correspond to the high voltage level and/or the low voltage level according to the actual demand of the MOG circuit to achieve the applications of the present invention.
- the operation of the MOG circuit of an embodiment could comprise following stages:
- the voltage levels of the first global control signal GAS 1 , the second global control signal GAS 2 , and the third global control signal GS 3 all correspond to an invalid state, which means that the first global control signal GAS 1 , the second global control signal GAS 2 , and the third global control signal GS 3 cannot be used to control corresponding units to work.
- the MOG circuit receives the MUX signal and outputs a corresponding scan signal.
- Black screen wake-up stage A low power wake-up gesture (LPWG) function is performed. As shown in FIG. 4 , the operation of this function comprises two stages: The first stage T 1 : The voltage level of the second global control signal GAS 2 corresponds to a valid state (such as a high voltage level). The second global control unit 30 pulls up the voltage level of the first node signal JS 1 (N) to turn on all the pixel circuits to perform a blackening operation on the screen. The second stage T 2 : The scan signals could be adjusted to be a low voltage level (all gate off) to reduce power consumption.
- LPWG low power wake-up gesture
- the first global control signal GAS is in the valid stage such that the voltage level of the first node signal JS 1 (N) could be pulled down through the first global control unit 20 to block the input of the MUX signal.
- the third global control signal GAS 3 is also in the valid state
- the second node signal JS 2 (N) is also in the valid state under the control of the clock signal of the corresponding stage.
- the second node signal JS 2 (N) controls the current-stage MUX circuit 200 to pull down all the scan signals to the voltage level of the first low voltage level signal VGL 1 /the second low voltage level signal VGL 2 to achieve the all-gate-off function.
- the voltage levels of the scan signals are not pulled down through the MUX signal to turn off all the scan lines. Instead, the above operation is performed to achieve the all-gate-off function. That is, the current-stage MUX circuit 200 does not need to endure the transformation process of the scan signals. Therefore, the loading condition of the current-stage MUX circuit 200 is alleviated to prevent from influencing the following operations or the gate driving operation. This could make the screen normally display.
- a display panel comprises a MOG circuit of any of the above embodiments.
- the display panel further comprises a signal generator.
- the signal generator 300 is connected the current-stage MUX circuit 200 and could provide a corresponding MUX signal. It could be understood that the signal generator 300 could generated the required MUX signal.
- the MOG circuit of an embodiment of the present invention could be integrated, but not limited to, in a gate driving circuit of an array substrate. Also, the MOG circuit could be in a gate driving circuit of a cell phone, a display, a TV.
- the GOA circuit of the present invention could be used in an LCD or a self-light-emitting display technology, such as an OLED technology.
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Abstract
Description
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CN202010591035.2A CN111681594A (en) | 2020-06-24 | 2020-06-24 | MOG circuit and display panel |
PCT/CN2020/111996 WO2021258539A1 (en) | 2020-06-24 | 2020-08-28 | Mog circuit and display panel |
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Also Published As
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WO2021258539A1 (en) | 2021-12-30 |
CN111681594A (en) | 2020-09-18 |
US20230343270A1 (en) | 2023-10-26 |
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